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JoelJoel posted:
 
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Aug 28, 2014 19:29
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| # ¿ Apr 25, 2024 04:55 |
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Chamale posted:Wait wait wait... They douse the rocket in liquid hydrogen, and then ignite that hydrogen, for a net decrease in temperature? Really illustrates the difference in heat transfer between liquids and gasses. No, they vent liquid hydrogen through channels between the inner and outer walls of the rocket nozzles to cool them, which then ignites via atmospheric oxygen when the rocket motors ignite. Space Shuttle Main Engines do the same thing with a closed system that routes the hydrogen from the fuel tanks, through the rocket nozzles, then through the turbopumps to the engine combustion chambers. The flame temperature is so hot that you have to have an actively cryogenicly cooled nozzle made of the highest temperature alloy that we know of just to keep it from melting during operation. Even more , the inner wall of the RS-68 engine is designed to slowly burn away while the engine is running. The carbon-rich exhaust gives the plume a yellow color, in comparison to the transparent flame from the SSME, even though both engines use the same fuel. Who cares if you partially slag your motor if you're just going to throw it into the sea when you're done, right?
CommanderApaul has a new favorite as of 16:12 on Nov 20, 2014 |
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Nov 20, 2014 16:07
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 This is the High Pressure Oxygen Turbopump from the Space Shuttle Main Engine. It's sole job is to pump liquid oxygen from the low pressure oxygen system into the high-pressure system and feed it into the combustion chamber. It has a power output of over 23,000 horsepower. CommanderApaul has a new favorite as of 00:10 on Nov 21, 2014 |
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Nov 20, 2014 23:58
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Q!=e, phone posting
CommanderApaul has a new favorite as of 00:11 on Nov 21, 2014 |
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Nov 21, 2014 00:09
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The Repo Man posted:Well goons, I think it's time to build us a motorcycle. I'm sure that our combined knowledge will only get most of us killed. Pictures do not do this thing justice. The gun is mounted off-center, both horizontally and vertically, so that the firing barrel lies directly along the centerline of the plane and recoils directly through both the horizontal and vertical center of gravity, since the recoil would be enough to alter the pitch and yaw of the plane. The recoil force is higher than the thrust that one of the engines puts out as well.
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Mar 4, 2015 18:14
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| # ¿ Apr 25, 2024 04:55 |
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This is the first time I've really tried an effort post, so I hope I'm doing this right. This is a M61 Vulcan gattling-style rotary cannon, first deployed in 1959. It fires 20mm rounds at 6,000 rounds per minute:  20x102mm rounds in a handheld magazine, for size:  This is a 40mm Bofor antiaircraft autocannon, first designed in the 1930s, deployed in WWII, and still in use today:  It fires 40x311mm shells, the 2nd one from the right. The shells are the far left are 30mm, which are similar in sized to what are fired from the GAU-8 Avenger in the A-10 posts above:  This is an M102 Howitzer, a towed artillery piece. It was introduced during the Vietnam war, and can drop 105mm high explosive shells at a rate of 10 rounds a minute with pinpoint accuracy on targets as far away as 15 miles:  It looks like this in operation: https://www.youtube.com/watch?v=oCoyLSSb-HI Here's a 105mm shell:  This is the Lockheed C-130 Hercules, the "your mom" joke of the US Air Force. It's big, fat, ugly, and slow, and it's the backbone of US military air transport service:  So slow, in fact, that Lockheed has a variant fitted out for refueling helicopters:  This is what a C130 looks like on the inside when some crazy motherfucker in the Pentagon asks Boeing to buy some C-130s from Lockheed and stuff 2 M61s, a 40mm Bofors, a 105mm M102 Howitzer and an AWACS worth of SIGINT equipment inside and turn it into a flying artillery piece called the AC130 Spectre  And this is what it looks like from the outside (wallpaper sized) 
CommanderApaul has a new favorite as of 15:12 on Mar 5, 2015 |
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Mar 5, 2015 15:06
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